Shortcut settings doesn't work as expected

[Michal Mikolas]

Hello,
fresh install Ubuntu 18.04 here.

# Bug description
When I try to change shortcuts in "Settings > Devices > Keyboard > Keyboard Shortcuts", some specific key combinations don't take any effect. For example:

- CTRL+ALT+LEFT
- CTRL+ALT+RIGHT
- PrtSc

No mather what action I put these combinations to, the action is not run when the combination is pressed.

# Workaround:
1) You have to disable some stuff with console magic like this:

$ gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-left "[]"
$ gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-right "[]"
$ gsettings set org.gnome.settings-daemon.plugins.media-keys screenshot ''

2) Now you can finally change the shortcuts in "Keyboard Shortcuts" settings.

# The final thoughts
I understand there is some high-level technology why some shortcuts are hard-wired to Ubuntu with "gsettings". But this high-level technology makes "Keyboard Shortcuts" settings not working as every average user expects. Making using Ubuntu experience painfull.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1809933/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]